Isotherm and infrared induced band of O2 have been studied in the temperature range 93–193 K. At low temperature and low coverage, two components of the fundamental vibrational band appear on both sides of the gas frequency. Their intensities with respect to T and to the number of adsorbed molecules have been measured in order to understand the interaction of O2 with NaA zeolite. The frequency shift of each component has been related to the orientation of the molecule, from considerations about the interaction potential.

A theoretical model of vibrational dephasing with motional narrowing by the librational motions of the molecules in their liquid cages is proposed and tested on the infrared ν6 degenerate fundamental of liquid methyl iodide and perdeutero methyl iodide over a temperature range of −190 to + 40 °C. The theory, which does not require artificial separation of vibrational and orientational coordinates, is particularly applicable to associated and sterically hindered liquids.

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